Thread:XXK1rbyF4nB0y69Xx/@comment-32452525-20180312004159/@comment-31486859-20180521063548

MegaGyarados wrote: Wait, so I beat Ultimate Choice difficulty 5 a number of times, yet I can’t unlock difficulty number 6. Do you know how I unlock it? Beat guest star with any character and beat difficulty 5 in the ultimate choice.

Very simple.